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tc168.hs:17:1: error:
• Could not deduce (C a1 (a2, b0))
from the context: C a1 (a2, b)
bound by the inferred type for ‘g’:
forall {a1} {a2} {b}. C a1 (a2, b) => a1 -> a2
at tc168.hs:17:1-16
The type variable ‘b0’ is ambiguous
• In the ambiguity check for the inferred type for ‘g’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
When checking the inferred type
g :: forall {a1} {a2} {b}. C a1 (a2, b) => a1 -> a2
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